After high profile arrests of actors like Robert Mitchum, Hollywood gave Anslinger full control over the script of any film that mentioned marijuana.
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The only authoritative voice that opposed Anslinger's campaign against cannabis was the one of the Mayor of New York Fiorello La Guardia, who appointed in 1938 a commission of investigation, and in 1944 strongly objected to Anslinger's campaign with the famous La Guardia Committee.